1: ματαιολογία
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(Strong's #3150 — Noun Feminine — mataiologia — mat-ah-yol-og-ee'-ah )

a noun corresponding to the above, is used in 1—Timothy 1:6 , RV, "vain talking" (AV, "vain jangling").

2: μωρολογία
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(Strong's #3473 — Noun Feminine — morologia — mo-rol-og-ee'-ah )

from moros, "foolish, dull, stupid," and lego, is used in Ephesians 5:4; it denotes more than mere idle "talk." Trench describes it as "that 'talk of fools' which is foolishness and sin together" (Syn. xxxiv).